The multiplication (*) operator produces the product of the operands.

The using declaration declares block-scoped local variables that are synchronously disposed. Like const, variables declared with using must be initialized and cannot be reassigned. The variable's value must be either null, undefined, or an object with a [Symbol.dispose]() method. When the variable goes out of scope, the [Symbol.dispose]() method of the object is called, to ensure that resources are freed.

A character class escape is an escape sequence that represents a set of characters.

The arguments.callee data property contains the currently executing function that the arguments belong to.

Trait for comparisons using the equality operator.

The restart attribute specifies whether or not an animation can restart.

The seed attribute represents the starting number for the pseudo random number generator of the <feTurbulence> filter primitive.

The JavaScript exception "invalid assignment left-hand side" occurs when there was an unexpected assignment somewhere. It may be triggered when a single = sign was used instead of == or ===.

The tabindex attribute allows you to control whether an element is focusable and to define the relative order of the element for the purposes of sequential focus navigation.

The surfaceScale attribute represents the height of the surface for a light filter primitive.